The Port of Singapore refers to a combination of facilities and stations Takethat take over a trade that supervises Singapore's international trading duties. Currently the world's second-busiest port in terms of total cargo, it is the fifth container port in the world, with half of the world's crude oil supply passing through, and the world's busiest recharge port. It was also the activistmost active port in the world by total cargo load until 2005 when it was exceeded by Shanghai Port. Thousands of ships land at the port, combining the port to more than 600 more ports in 123 countries on more than six regions. The Port of Singapore is not mere economic mercy, but an economic need because Singapore is lacking in land and natural resources. The Portport is important for importing natural resources, and then later re-exporting products after they have been refined and formed in some way, for example, wafer fabrication or oil refining to produce income. The service industries such as hospitality services typical of a port of call restock the food and water stocks on ships. Ships move between the Indian Ocean and the Pacific Ocean through the Singapore Strait. The Straits of Johor on the country's north are for impracticable ships due to the Johor-Singapore Causeway, built-in 1923, which links the town of Woodlands, Singapore to the city of Johor Bahru in Malaysia.